Development of Three-Phase HB-type Stepping Motors

Abstract

In hybrid (HB) type stepping motors, two and five-phases are used respectively for medium and high resolution purposes, but three-phase motors have been disregarded. Then we started in the development of three-phase HB-type motors, believing in their possibilities. In this paper, design consideration and measured performance of three-phase HB-type motors are described. The developed motor (B) with 3.7° step angle has comparable torque characteristics and reduced vibration as compared with the usual two-phase motor, and the motor (A) with 0.6° step angle is able to rotate at a speed of over 2, 000 rpm by attaching an elastic inertia damper. In conclusion, three-phase HB-type stepping motors are expected to have a bright future.